期刊
NANO LETTERS
卷 10, 期 4, 页码 1308-1313出版社
AMER CHEMICAL SOC
DOI: 10.1021/nl904106t
关键词
Transient absorption imaging; epitaxial graphene; carrier dynamics; electron-phonon coupling
类别
资金
- Office of Basic Energy Science of the U.S. Department of the Energy
- National Science Foundation [CHE-0647444, ECCS-0802125, DMR-0856240]
- Notre Dame Faculty Research Program
- Nanoelectronics Research Initiative
- Div Of Electrical, Commun & Cyber Sys
- Directorate For Engineering [1530723] Funding Source: National Science Foundation
- Div Of Electrical, Commun & Cyber Sys
- Directorate For Engineering [0846910] Funding Source: National Science Foundation
Transient absorption microscopy was employed to image charge carrier dynamics in epitaxial multilayer graphene. The carrier cooling exhibited a biexponential decay that showed a significant dependence on carrier density. The fast and slow relaxation times were assigned to coupling between electrons and optical phonon modes and the hot phonon effect, respectively. The limiting value of the slow relaxation time at high pump intensity reflects the lifetime of the optical phonons. Significant spatial heterogeneity in the dynamics was observed due to differences in coupling between graphene layers and the substrate.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据